Discussion
If x = 5, y = 3 and z = 2 then xz (4y - 2z) is
Answer: B
Substitute \( x = 5 \), \( y = 3 \), \( z = 2 \) and clear the bracket first.
\[ 4y - 2z = 12 - 4 = 8 \]
\[ xz = 5 \times 2 = 10 \]
\[ 10 \times 8 = 80 \]
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